Hello,
I'm experiencing a strange behavior that I was able to reproduce in two Arduino 2560 boards. I had a Dallas temperature sensor connected to digital pin 30, trying to read values:
DS18B20 ds(30);
define ONEWIRE_SEARCH 0;
// main loop:
Serial.println("Temp: " + String(ds.getTempC()) + " at " + String(millis()) + "ms" );
All working until by mistake I also wrote a pinMode/digitalRead pointed to the same pin where the sensor was.
I was expecting to have a push botton in that ping and wrote the following code:
pinMode(30, INPUT);
// main loop:
Serial.println(digitalRead(30));
I powered the board and the noticed issue. As expected the sensor didn't work. After moving the sensor to another pin I noticed that PIN 30 was always HIGH from this point - even without anything connected to it.
I replicated this "experiment" in another board and got the same result. Now I've two boards with PIN 30 always readingHIGH.
Is there any reason why this happened? Does the GitHub - matmunk/DS18B20: Arduino library for the Maxim Integrated DS18B20 1-Wire temperature sensor. library / 1 wire set anything in the microcontroller that can result in this behavior even after reprogramming with a different program? Is it even fixable?
A new program like this:
void setup() {
Serial.begin(9600);
Serial.println("Setup!");
pinMode(30, INPUT);
}
void loop() {
delay(1000);
Serial.println(digitalRead(30));
}
Is always outputting "1" now on that pin, even if nothing is connected to it.
Thank you.